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Introduction to Nitric Acid

Which oxide o...

Question

Which oxide of nitrogen is formed on subjecting nitric acid to heat or light?

A

N_{2} O_{4}

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B

N_{2} O_{5}

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C

N O_{2}

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D

N_{2} O

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Solution

The correct option is C $N O_{2}$
Nitric acid is subject to thermal or light decomposition and for this reason it was often stored in brown glass bottles:
4 HNO₃ → 2 H₂O + 4 NO₂ + O₂.
This reaction may give rise to some non-negligible variations in the vapor pressure above the liquid because the nitrogen oxides produced dissolve partly or completely in the acid.

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Similar questions

Q. The nitrogen oxides that contain N – N bond(s) is:

Nitrogen forms largest oxides as it is capable of forming stable multiple bonds with oxygen. They range from

N_{2} O

(O.S of nitrogen +1) through

N O, N_{2} O_{3}, N_{2} O_{4}

N_{2} O_{5}

(O.S of nitrogen +5).

The following points are important regarding the oxides of nitrogen.

(a) All oxides of nitrogen except

N_{2} O_{5}

are endothermic because large amount of energy is required to dissociate the stable molecule of oxygen and nitrogen.

(b) The small electronegativity difference between oxygen and nitrogen makes N-O bond easily breakable to give oxygen and hence oxides of nitrogen are said to be better oxidizing agents.

N_{2} O_{5}

, all are gases at ordinary temperature.

N_{2} O_{3}

is stable only at a lower temperature (253 K).

N_{2} O

N O

which are neutral oxides, all are acidic oxides that dissolve in water forming corresponding oxyacids.

(e) They are also a good example of illustrating the concept of resonance.

The gas which is acidic in nature is ________.

Q. Cold, dilute nitric acid reacts with copper to form _____ (hydrogen, nitrogen dioxide, nitric oxide).

Q. Assertion :Nitric oxide is paramagnetic while

N_{2} O

is diamagnetic. Reason: Nitrogen exhibits variable valency in

N O

N_{2} O

.

Q. Of the following statements which are true for

N O_{2}

?

i)

Nitrogen dioxide brown liquid turns pale on cooling and becomes colourless solid
ii)

N O_{2}

undergoes dimerisation to form

N_{2} O_{4}

N O_{2}

is paramagnetic,

N_{2} O_{4}

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